📁 File Handling

# File likhna (write mode)
with open("test.txt", "w") as f:
    f.write("Namaste Python!\n")
    f.write("Yeh file hai.\n")

# File padhna (read mode)
with open("test.txt", "r") as f:
    content = f.read()
    print(content)

# "r"  — Read only (default)
# "w"  — Write (purani file overwrite)
# "a"  — Append (ant mein add)
# "r+" — Read + Write

# Append — naya data add karo
with open("log.txt", "a") as f:
    f.write("Naya entry\n")

# Line by line padhna
with open("test.txt", "r") as f:
    for line in f:
        print(line.strip())

import os

# Current directory
print(os.getcwd())

# Files list karo
print(os.listdir("."))

# File exist karta hai?
print(os.path.exists("test.txt"))  # True/False

# File size
print(os.path.getsize("test.txt"))

# Chapter 12: File Handling — Advanced Practice
print("=== File Handling Practice ===")

# Example 1: Basic usage
result = "Python mein File Handling bahut powerful hai!"
print(result)

# Example 2: Real world use
data = ["File Handling", "Python", "Hindi", "PythonHindi.in"]
for item in data:
    print(f"Item: {item}")

print("\nPractice complete! Great job! 🎉")

# Chapter 12: File Handling — Advanced Examples
# Yeh code copy karo aur run karo!

# Example 1: Basic concept
print("=== Chapter 12: File Handling ===")

# Example 2: List operations
items = ["Python", "Hindi", "Code", "Practice"]
for i, item in enumerate(items, 1):
    print(f"{i}. {item}")

# Example 3: Dictionary usage
chapter_info = {
    "number": 12,
    "title":  "File Handling",
    "level":  "Intermediate",
    "done":   False
}
for key, value in chapter_info.items():
    print(f"  {key:10}: {value}")

# Example 4: Function
def practice_summary(chapter, completed=False):
    status = "Complete ✅" if completed else "In Progress ⏳"
    return f"Chapter {chapter}: {status}"

print(practice_summary(12))
print(practice_summary(12, True))